CN103230731A - Technology for treating ammonia-containing exhaust gas by electrochemical method - Google Patents
Technology for treating ammonia-containing exhaust gas by electrochemical method Download PDFInfo
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- CN103230731A CN103230731A CN2013100716657A CN201310071665A CN103230731A CN 103230731 A CN103230731 A CN 103230731A CN 2013100716657 A CN2013100716657 A CN 2013100716657A CN 201310071665 A CN201310071665 A CN 201310071665A CN 103230731 A CN103230731 A CN 103230731A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
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Abstract
The invention discloses a technology for treating ammonia-containing exhaust gas by an electrochemical method. The technology realizes the combination of the electrochemical method and an absorption method. Through absorption and electrochemical oxidation, ammonia-containing exhaust gas treatment and standardized discharge are realized. The technology for treating ammonia-containing exhaust gas by the electrochemical method realizes reasonable control of a pH value of an absorption liquid and a concentration of a salt and realizes absorption liquid cyclic utilization. The technology has good effects and a practical meaning.
Description
Affiliated technical field
The present invention relates to a kind of electrochemical process and handle the method for ammonia-contaminated gas, the method of the ammonia-contaminated gas that especially a kind of processing machine processing industry and chemical industry produce, the processing aspect that it can be used for multiple ammonia-contaminated gas belongs to environmental project and technical field of waste gas treatment.
Background technology
When containing ammonia in the air, waste gas has strong ammonia stink, and the people is 0.5～1.0mg/m to the odor threshold of ammonia
3, so contain the complaint that ammonia is easy to suffer people in the waste gas.In addition, ammonia also is a kind of relatively more responsive pollutant concerning atmosphere, because it is deposited to ground with rainwater easily, enters rivers and lakes through rainwash, causes the eutrophication of rivers and lakes.Therefore, the efficient processing of ammonia-contaminated gas back up to standard discharging seems particularly important.
At present, the technology that ammonia-contaminated gas deamination treatment system is traditional is that the normal acid solution that adopts absorbs, because the no recovery value in the absorption liquid, therefore, absorb waste liquid and entrust outward transport to handle as discarded object, and the absorption liquid waste water acidity that produces is stronger, has stronger corrosivity, belong to the hazardous industry discarded object, disposal cost is huge.
Summary of the invention
The present invention organically combines electrochemical process and absorption process, will rationally control the pH value of absorption liquid and the concentration of salt by the processing and the qualified discharge that absorb, electrochemical oxidation is realized ammonia-contaminated gas, realizes the recycling of absorption liquid.This invention has effect and practical significance preferably.
Implementation method of the present invention is as follows:
At first ammonia-contaminated gas enters waste gas absorption tower 2 by the air inlet 1 of waste gas absorption tower under the attraction of air-introduced machine 4, ammonia on the filler 3 of exhaust gas treating tower in the waste gas is absorbed by the absorption liquid that spray pump 7 sprays, absorption liquid behind the absorption ammonia enters the catch basin 6 of waste gas absorption tower bottom, absorption liquid in the catch basin 6 is by 8 monitoring of pH controller, absorption liquid in the catch basin 6 is promoted by circulating pump 9 and enters electrochemical oxidation groove 10, battery lead plate in the electrochemical oxidation groove is by power supply 11 power supplies, by 12 moisturizings of running water filling pipe, the waste gas after the processing was through blast pipe 5 dischargings when the absorption liquid in the catch basin lost.
Innovative point of the present invention mainly contains as follows:
1, spray liquid is formulated by salt and diluted acid, and initial pH value is formulated as 2-6, and wherein salt can be sodium chloride or potassium chloride, and its mass concentration is 1%-5%.
2, the present invention is by pH controller control reaction pH value, and pH control is set to 7.5-9.5 usually, realizes the recycling of absorption liquid in course of reaction.The related electrochemical reaction formula of electrochemistry of the present invention is as follows:
Under the state of energising, the electronics of electrode surface is delivered to anode tap by WATER AS FLOW MEDIUM from cathode terminal, and electronics can produce oxidizing substance in transfer process, as: OH, ClO
-, Cl, H
2O
2With O etc.
The electrochemical oxidation of ammonia is removed 2 kinds of approach.1. direct oxidation: ammonia nitrogen can directly lose 3 electronics at anode and be oxidized to the nitrogen G﹠W, sees formula (1); 2. indirect oxidation: chlorion at first is oxidized to free chlorine at anode, is dissolved in then and forms " active chlorine " in the aqueous solution, produces nitrogen as strong oxidizer and ammonia nitrogen reaction, finally makes ammonia obtain removal.The indirect electrochemical oxidizing process of ammonia is seen formula (2).
2NH
3+6·OH→N
2+6H
2O+6e
- (1)
HClO→ClO
-+H
- (4)
3, the present invention has organically combined absorption process and electrochemical process, and combines the method for automatic control.
Description of drawings
Fig. 1 electrochemical process is handled the process flow diagram of ammonia-contaminated gas
Among the figure: 1. waste gas absorption tower air inlet; 2. waste gas absorption tower; 3. filler; 4. air-introduced machine; 5. high-altitude blast pipe; 6. catch basin; 7. spray pump; 8.pH controller; 9. circulating pump; 10. electrochemical oxidation groove; 11. power supply; 12. running water filling pipe.
The specific embodiment
The present invention will be further described below in conjunction with drawings and Examples.
As shown in Figure 1, at first ammonia-contaminated gas is introduced waste gas absorption tower air inlet 1, the ammonia in the waste gas is absorbed by the absorption liquid under spray pump 7 sprays.The initial pH value of absorption liquid is 2-7, and the sodium chloride that contains 1%-5%, after absorbing ammonia, the pH of absorption liquid will rise to some extent, when the pH of absorption liquid rises to 8-9, to the power supply of electrochemical oxidation groove, the ammonia nitrogen in the absorption liquid is with oxidized removal by pH controller control power supply 11, and the pH of absorption liquid will descend to some extent then.Absorption liquid absorbs after the ammonia again, and pH can rise again, is powered to the electrochemical oxidation groove by pH controller control power supply 11 then, and the ammonia nitrogen in the absorption liquid is with oxidized removal, and the pH of absorption liquid will descend to some extent then.The reaction that so goes round and begins again.When the water level in the catch basin descends, by the moisturizing of running water filling pipe to initial water level.
Wherein circulating pump 9 can be to be in running status also can be and the power supply 11 common states that move always.
Specific embodiment
Embodiment 1
Wuxi City engineering shop produces ammonia-contaminated gas in workpiece nitrogenize production process, ammonia content is about 110mg/l, and air quantity is 2000m
3/ h, for handling this waste gas, the electrochemical process of Fig. 1 is handled ammonia-contaminated gas technology in ad hoc meter such as this explanation, the absorption liquid sodium chloride content of work is 1%, and initial pH value is 2, and regulating the employed acid of pH value is hydrochloric acid, pH control is set to 7.5, the operating voltage of power supply 11 is 2.5V, and the ammonia content of waste gas is 5mg/l after treatment, reaches " odorant pollutant discharge standard " (GB14554-93) requirement of standard.
Wuxi City process for treating surface Co., Ltd workshop produces ammonia-contaminated gas in process of production, and ammonia content is about 80mg/l, and air quantity is 4000m
3/ h, for handling this waste gas, the electrochemical process of Fig. 1 is handled ammonia-contaminated gas technology in ad hoc meter such as this explanation, the absorption liquid sodium chloride content of work is 2%, and initial pH value is 3, and regulating the employed acid of pH value is hydrochloric acid, pH control is set to 8.5, the operating voltage of power supply 11 is 2.1V, and the ammonia content of waste gas is 4mg/l after treatment, reaches " odorant pollutant discharge standard " (GB14554-93) requirement of standard.
Wuxi City Production in Chemical Plant workshop produces ammonia-contaminated gas in process of production, and ammonia content is about 50mg/l, and air quantity is 8000m
3/ h, for handling this waste gas, the electrochemical process of Fig. 1 is handled ammonia-contaminated gas technology in ad hoc meter such as this explanation, the absorption liquid KCE content of work is 3%, and initial pH value is 2, and regulating the employed acid of pH value is hydrochloric acid, pH control is set to 9.5, the operating voltage of power supply 11 is 2.0V, and the ammonia content of waste gas is 4mg/l after treatment, reaches " odorant pollutant discharge standard " (GB14554-93) requirement of standard.
Embodiment 4
The mechanical long production of Wuxi City workshop produces ammonia-contaminated gas in process of production, and ammonia content is about 30mg/l, and air quantity is 5000m
3/ h, for handling this waste gas, the electrochemical process of Fig. 1 is handled ammonia-contaminated gas technology in ad hoc meter such as this explanation, the absorption liquid sodium chloride content of work is 5%, and initial pH value is 6, and regulating the employed acid of pH value is sulfuric acid, pH control is set to 8.0, the operating voltage of power supply 11 is 2.0V, and the ammonia content of waste gas is 4mg/l after treatment, reaches " odorant pollutant discharge standard " (GB14554-93) requirement of standard.
Claims (5)
1. an electrochemical process is handled the method for ammonia-contaminated gas, it is characterized in that: this method is absorbed in the ammonia in the ammonia-contaminated gas in the absorption liquid by air-introduced machine, absorption tower and filler, absorption liquid is made up of salt and diluted acid, its initial pH value is through overregulating, the pH value of absorption liquid is by the pH controller monitoring, when absorption liquid reaches setting pH value, by pH controller control power supply the electrochemical oxidation groove is powered, absorption liquid is the process electrochemical reaction in the electrochemical oxidation groove, wherein the oxidized branch of the ammonia of Xi Shouing is taken off, and absorption liquid can be recycling under the situation of moisturizing.
2. method according to claim 1, it is characterized in that: the salt of described composition absorption liquid is sodium chloride or potassium chloride.
3. method according to claim 1, it is characterized in that: the diluted acid of described composition absorption liquid is hydrochloric acid or sulfuric acid.
4. method according to claim 1, it is characterized in that: described absorption liquid initial pH value is adjusted to 2-6.
5. method according to claim 1 is characterized in that: the pH value that described absorption liquid reaches setting is 7.5-9.5.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110605003A (en) * | 2019-08-11 | 2019-12-24 | 杭州和睿环保科技发展有限公司 | Recycling method of fly ash washing waste gas absorption liquid |
| CN114748998A (en) * | 2022-03-31 | 2022-07-15 | 华中科技大学 | On-vehicle electrochemistry deodorization case |
| CN114768480A (en) * | 2022-05-27 | 2022-07-22 | 广东益康生环保科技有限公司 | Device for removing ammonia nitrogen in citric acid absorbent in farm and treatment process thereof |
| WO2022260526A1 (en) * | 2021-06-11 | 2022-12-15 | Wärtsilä Gas Solutions Norway AS | A system for removing ammonia from an ammonia-containing gas and a method for removing ammonia from an ammonia-containing gas |
Citations (6)
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|---|---|---|---|---|
| US4379036A (en) * | 1981-08-07 | 1983-04-05 | United Technologies Corporation | Continuous electrochemical ammonia scrubber |
| CN1356921A (en) * | 1999-04-16 | 2002-07-03 | Cbl技术公司 | Organic acid scrubber and methods |
| CN101239278A (en) * | 2008-03-07 | 2008-08-13 | 黄立维 | Device for cleaning treatment harmful gas and technique thereof |
| CN101474527A (en) * | 2008-12-31 | 2009-07-08 | 黄立维 | Method for absorption treatment of noxious exhaust gas by electrochemistry method |
| CN202028335U (en) * | 2011-03-15 | 2011-11-09 | 苏州金宏气体股份有限公司 | Waste gas recycling device of ultra pure ammonia production system |
| CN102895864A (en) * | 2012-10-30 | 2013-01-30 | 黄立维 | Method and device for absorbing and purifying harmful gas through electrochemical oxidation |
-
2013
- 2013-03-07 CN CN2013100716657A patent/CN103230731A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4379036A (en) * | 1981-08-07 | 1983-04-05 | United Technologies Corporation | Continuous electrochemical ammonia scrubber |
| CN1356921A (en) * | 1999-04-16 | 2002-07-03 | Cbl技术公司 | Organic acid scrubber and methods |
| CN101239278A (en) * | 2008-03-07 | 2008-08-13 | 黄立维 | Device for cleaning treatment harmful gas and technique thereof |
| CN101474527A (en) * | 2008-12-31 | 2009-07-08 | 黄立维 | Method for absorption treatment of noxious exhaust gas by electrochemistry method |
| CN202028335U (en) * | 2011-03-15 | 2011-11-09 | 苏州金宏气体股份有限公司 | Waste gas recycling device of ultra pure ammonia production system |
| CN102895864A (en) * | 2012-10-30 | 2013-01-30 | 黄立维 | Method and device for absorbing and purifying harmful gas through electrochemical oxidation |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110605003A (en) * | 2019-08-11 | 2019-12-24 | 杭州和睿环保科技发展有限公司 | Recycling method of fly ash washing waste gas absorption liquid |
| CN110605003B (en) * | 2019-08-11 | 2022-01-21 | 浙江天象环境服务有限公司 | Recycling method of fly ash washing waste gas absorption liquid |
| WO2022260526A1 (en) * | 2021-06-11 | 2022-12-15 | Wärtsilä Gas Solutions Norway AS | A system for removing ammonia from an ammonia-containing gas and a method for removing ammonia from an ammonia-containing gas |
| CN114748998A (en) * | 2022-03-31 | 2022-07-15 | 华中科技大学 | On-vehicle electrochemistry deodorization case |
| CN114768480A (en) * | 2022-05-27 | 2022-07-22 | 广东益康生环保科技有限公司 | Device for removing ammonia nitrogen in citric acid absorbent in farm and treatment process thereof |
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Application publication date: 20130807 |